工作需要，经常会在工作的台式机和笔记本之间传文件或者需要拷贝文本，两个机器都位于局域网内，传文件或者文本的方式有很多种，之前是通过共享文件夹来进行文件的拷贝，或者通过SVN进行同步。文本传递比较简单，可以通过两台机器上装QQ登两个号码，或者在共享目录下建一个TXT，或者发电子邮件等等。
不过上面这些方法总觉得不直接，所以想基于P2P做一个小的局域网文件和文字传输小工具。
WinForm的工程，界面方面的代码就不贴了，大家自己根据喜好设计就好了，主要把TCP数据传输的代码和逻辑贴出来：
1. 文件和文本传输的通用方法：
private string ReceiveControl(Socket socket) { int bufSize = 1024; byte[] buf = new byte[bufSize]; int len = socket.Receive(buf); return len > 0 ? Encoding.UTF8.GetString(buf, 0, len) : String.Empty; } private void SendControl(Socket socket, string controlMsg) { byte[] msgBytes = Encoding.UTF8.GetBytes(controlMsg); socket.Send(msgBytes); } private string ReceiveContent(Socket socket, int contentLen) { int receivedLen = 0; int bufSize = 1024; byte[] buf = new byte[bufSize]; StringBuilder sb = new StringBuilder(); while (receivedLen < contentLen) { int len = socket.Receive(buf); if (len > 0) { sb.Append(Encoding.UTF8.GetString(buf, 0, len)); receivedLen += len; } } return sb.ToString(); } private void SendContent(Socket socket, string content) { byte[] contentBytes = Encoding.UTF8.GetBytes(content); SendControl(socket, contentBytes.Length.ToString()); ReceiveControl(socket); socket.Send(contentBytes); } private void ReceiveFile(Socket socket, string fileName, int fileLen) { string filePath = Path.Combine(GetCurrentUserDesktopPath(), RenameConflictFileName(fileName)); using (Stream fs = new FileStream(filePath, FileMode.Create, FileAccess.ReadWrite)) { int bufLen = 1024; int receivedLen = 0; byte[] buf = new byte[bufLen]; int len = 0; while (receivedLen < fileLen) { len = socket.Receive(buf); fs.Write(buf, 0, len); receivedLen += len; } } } private void SendFile(Socket socket, string filePath) { using (Stream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read)) { SendControl(socket, GetFileNameFromPath(filePath)); ReceiveControl(socket); SendControl(socket, fs.Length.ToString()); ReceiveControl(socket); int bufLen = 1024; byte[] buf = new byte[bufLen]; long readLen = 0; long fileLen = fs.Length; int len = 0; while (readLen < fileLen) { len = fs.Read(buf, 0, bufLen); readLen += len; int sentLen = 0; int realSent = 0; int left = 0; while (sentLen < len) { left = len - realSent; realSent = socket.Send(buf, sentLen, left, SocketFlags.None); sentLen += realSent; } } } }
2.连接，发送文字/文件，重命名文件等方法：
private void SendText() { if (connected) { if (!String.IsNullOrEmpty(this.TextToSend.Text)) { string txt = this.TextToSend.Text; SendControl(clientSocket, "Text"); ReceiveControl(clientSocket); SendContent(clientSocket, txt); ReceiveControl(clientSocket); } } } private void Connect() { try { if (!connected) { passive = false; IPAddress serverIPAddress = IPAddress.Parse(this.ServerIPAddress.Text); clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); clientSocket.Connect(serverIPAddress, 60000); string msg = ReceiveControl(clientSocket); if (msg.Equals("Connected")) { this.ConnectBtn.Text = "Disconnect"; connected = true; } } else { passive = true; SendControl(clientSocket, "Disconnect"); clientSocket.Close(); this.ConnectBtn.Text = "Connect"; connected = false; } } catch (Exception err) { MessageBox.Show(string.Format("Failed to connect to server, error: {0}", err.ToString())); } } private void ServerThread() { IPAddress local = IPAddress.Parse("0.0.0.0"); Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); server.Bind(new IPEndPoint(local, 60000)); server.Listen(1); while (true) { Socket receivedClientSocket = server.Accept(); IPEndPoint clientEndPoint = (IPEndPoint)receivedClientSocket.RemoteEndPoint; SendControl(receivedClientSocket, "Connected"); if (passive) { clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); clientSocket.Connect(clientEndPoint.Address, 60000); string msg = ReceiveControl(clientSocket); if (msg.Equals("Connected")) { connected = true; this.ConnectBtn.Text = "Disconnect"; this.ServerIPAddress.Text = clientEndPoint.Address.ToString(); } } while (connected) { string msg = ReceiveControl(receivedClientSocket); switch (msg) { case "Disconnect": receivedClientSocket.Close(); clientSocket.Close(); this.ConnectBtn.Text = "Connect"; passive = true; connected = false; break; case "Text": SendControl(receivedClientSocket, "Received"); int length = Convert.ToInt32(ReceiveControl(receivedClientSocket)); SendControl(receivedClientSocket, "Received"); string content = ReceiveContent(receivedClientSocket, length); SendControl(receivedClientSocket, "Received"); this.TextToSend.Text = content; break; case "File": SendControl(receivedClientSocket, "Received"); string fileName = ReceiveControl(receivedClientSocket); SendControl(receivedClientSocket, "Received"); int fileLen = Convert.ToInt32(ReceiveControl(receivedClientSocket)); SendControl(receivedClientSocket, "Received"); ReceiveFile(receivedClientSocket, fileName, fileLen); SendControl(receivedClientSocket, "Received"); MessageBox.Show("File Received"); break; } } } } private string GetFileNameFromPath(string path) { int index = path.LastIndexOf('\\'); return path.Substring(index + 1); } private string RenameConflictFileName(string originalName) { string desktopPath = GetCurrentUserDesktopPath(); int extensionIndex = originalName.LastIndexOf("."); string fileName = originalName.Substring(0, extensionIndex); string extensionName = originalName.Substring(extensionIndex + 1); int renameIndex = 1; string newNameSuffix = String.Format("({0})", renameIndex); string finalName = originalName; string filePath = Path.Combine(desktopPath, finalName); if (File.Exists(filePath)) { finalName = String.Format("{0} {1}.{2}", fileName, newNameSuffix, extensionName); filePath = Path.Combine(desktopPath, finalName); } while (File.Exists(filePath)) { renameIndex += 1; string oldNameSuffix = newNameSuffix; newNameSuffix = String.Format("({0})", renameIndex); finalName = finalName.Replace(oldNameSuffix, newNameSuffix); filePath = Path.Combine(desktopPath, finalName); } return finalName; } private string GetCurrentUserDesktopPath() { return Environment.GetFolderPath(System.Environment.SpecialFolder.Desktop); }
运行截图：
完整代码可以到下面的地址下载：
http://download.csdn.net/detail/qwertyupoiuytr/9895436
